Tidal Energy. by Lori DeLeon. La Rance tidal power plant in La Rance, France . What is tidal energy?. Tidal power facilities harness the energy from the rise and fall of tides. Two types of tidal plant facilities. Tidal barrages Tidal current turbines
by Lori DeLeon
La Rance tidal power plant in La Rance, France
Single basin system-
Ebb generation: During flood tide basin is filled and sluice gates are closed , trapping water. Gates are kept closed until the tide has ebbed sufficiently and thus turbines start spinning and generating electricity.
Flood generation: The basin is filled through the turbine which generate at flood tide.
Two way generation:Sluice gates and turbines are closed until near the end of the flood tide when water is allowed to flow through the turbines into the basin creating electricity. At the point where the hydrostatic head is insufficient for power generation the sluice gates are opened and kept open until high tide when they are closed. When the tide outside the barrage has dropped sufficiently water is allowed to flow out of the basin through the turbines again creating electricity.
Double-basin system: There are two basins, but it operates similar to en ebb generation, single-basin system. The only difference is a proportion of the electricity is used to pump water into the second basin allowing storage.
Located in Orkney, Scotland. Comprises an area of 975 km2 and 70 islands.
Orkney Islands could generate 18,000 GW h per year.
Operational since 2005.
Test center for full-scale grid-connected prototypes of tidal current turbines.
Monitor impact on the environment.